Four novel bridged dianilines containing fluorine were synthesized using 4-chloro-3, 5-dinitrobenzotrifluoride and diamine by two step condensation and reduction. The structures of corresponding compounds were determined by means of IR, NMR and elemental analysis.
A heteropolyanion-containing polypyrrole/carbon nanotube modified electrode has been fabricated through entrapment of phosphomolybdic acid (H3PMo12O40) in polypyrrole (PPy) film on multi-walled carbon nanotubes (MWNTs) modified gold electrode. The electrochemical behavior and the electrocatalytic property of the modified electrode were investigated in acidic solution. Compared with the H3PMo12O40/ PPy/ gold electrode, the H3PMo12O40/ PPy/ MWNTs/ gold electrode has shown enhanced electrocatalytic property to the reduction of nitrite. Steady-state amperometry has been applied to characterize the modified electrode as an amperometric sensor for the determination of nitrite. Effects of PPy film thickness and MWNTs concentration on the current response of the modified electrode for the detection of nitrite have been investigated and discussed. Under the optimized conditions, a linear range from 5.0 x 10(-6) to 3.4 x 10(-2) M has been observed for the H3PMo12O40/ PPy/ MWNTs/ gold electrode with a sensitivity of 1214.1 mA M-1 cm(-2) and a detection limit of 1.0 x 10(-6) M according to a signal-to-noise ratio of 3.
Hydrophobic-hydrophilic macroporous polydivinylbenzene/polymethylacrylethylenediamine IPN (PDVB/PMAEM IPN) was synthesized indirectly through the strong forced compatibility. The effects of the hydrophobicity of adsorbate on the adsorption of salicylic acid and 5-sulfosalicylic acid onto the hydrophobic-hydrophilic PDVB/PMAEM IPN were investigated. PDVB/PMAEM IPN exhibited greater adsorption capacity of salicylic acid than that of 5-sulfosalicylic acid. The absolute values of Delta H, Delta G and Delta S of the adsorption of salicylic acid onto PDVB/PMAEM IPN were greater than those of 5-sulfosalicylic acid, indicating the adsorption of salicylic acid onto PDVB/PMAEM IPN was more welcome. Adsorption mechanism proved that greater adsorption capacity of salicylic acid onto PDVB/PMAEM IPN than that of 5-sulfosalicylic acid was attributed to the stronger hydrophobicity of salicylic acid. (C) 2016 Elsevier B.V. All rights reserved.
[俞善信; 管仕斌; 张鲁西] Department of Chemistry, Coll. of Chem. and Chem. Engineering, Hunan Normal University, Changsha 410081, China;[文瑞明] Dept. of Chem./Environmentally Eng., Hunan City University, Yiyang 413049, China